Make tab audible and muted states and cause available for an extension API

chrome/browser/ui/tabs/tab_strip_model.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 
@@ skipping 1020 matching lines @@
         for (size_t i = indices.size(); i > 0; --i) {
           if (!IsAppTab(indices[i - 1]))
             SetTabPinned(indices[i - 1], false);
         }
       }
       break;
     }
 
     case CommandToggleTabAudioMuted: {
       const std::vector<int>& indices = GetIndicesForCommand(context_index);
-      const bool mute = !chrome::AreAllTabsMuted(*this, indices);
-      if (mute)
+      const bool muted = !chrome::AreAllTabsMuted(*this, indices);
+      if (muted)
         content::RecordAction(UserMetricsAction("TabContextMenu_MuteTabs"));
       else
         content::RecordAction(UserMetricsAction("TabContextMenu_UnmuteTabs"));
       for (std::vector<int>::const_iterator i = indices.begin();
            i != indices.end(); ++i) {
-        chrome::SetTabAudioMuted(GetWebContentsAt(*i), mute);
+        chrome::SetTabAudioMuted(GetWebContentsAt(*i), muted, "user");
       }
       break;
     }
 
     case CommandBookmarkAllTabs: {
       content::RecordAction(
           UserMetricsAction("TabContextMenu_BookmarkAllTabs"));
 
       delegate_->BookmarkAllTabs();
       break;
@@ skipping 370 matching lines @@
 void TabStripModel::ForgetOpenersAndGroupsReferencing(
     const WebContents* tab) {
   for (WebContentsDataVector::const_iterator i = contents_data_.begin();
        i != contents_data_.end(); ++i) {
     if ((*i)->group() == tab)
       (*i)->set_group(NULL);
     if ((*i)->opener() == tab)
       (*i)->set_opener(NULL);
   }
 }